Builder mechanism



& 1937- J. s. FuRTAbo, JR

BUILDER MECHANISM 7 Sheets-Sheet l Filed Marsh 9, 1934 EIIQQEE 17502271507 Jo/m 6. Warm 79.

Oct. 5, 1937. Jl s. FURTAD'O. JR

BUILDER MECHANISM Filed March 9, 1934 7 Sheets-Sheet ,2

Oct. .5, 1937. J. 5. FURTADO. JR 2,095,214

BUILDER MECHANISM Filed March 9, 1934 7 Sheets-Sheet 53 fizqerziar' John Si WM Jr.

- 7- J. s. FURTADO, JR

BUILDER MECHANISM Filed March 9, 1934 7 Sheets-Sheet 4 Oct. 5, 19 37; Y J. S.FU'RTADO. JR 2,095,214

BUILDER MECHANISM Filed March 9, 1934 7 Sheets-Sheet 5 3 J. s. FURTADO. JR

BUILDER MECHANISM Filed March 9, 1934 7 Sheets-Sheet 6 fiwevzkv July .5. iurzmzo Jr. 6y 76 ya Patented Oct. 5,1937

A UNlTED sures ren't VOFFIE This invention pertains to builder mechanism for spinning frames, twisting frames, or similar textile machines, and relates more particularly to an improved bunch builder and traverse'mechanism, and to a method of'winding yarn upon bobbins or the like by the use of such mechanism.

Bobbins employed in automatic weft replenishing looms, are desirably-provided with a small bunch of yarn, for example,.near the end of the bobbin, for engagement by the feeder of lthe replenishing me'chanismof the loom in order to insure efficient operation of such mechanism.'

One object of the present invention is toprovide improved and effective means, applicable without substantial difficulty to old or new frames of usual commercial types, for building a traverse-Wound preliminary bunch on the bobbin, and designed automatically to change over from bunch build-- ing to a longer traverse after 'a predetermined period of operation. V

The builder motion of the usual ring frame forms a yarn mass having a long taper at its lower end. Such a yarn mass contains from to less yarn than would be the case if the yarn mass had a shorter taper or abrupt shoulder 'at its lower end. A further object of the in-' vention is to provide builder'mechanism, .applicable to ring frames of ordinary type, such that more than the usual amount of' yarn may be wound on a given bobbin as, for example, by shortening and making more abrupt theitaper of the yarn mass at the lower endof the bobbin. By placing more yarn on the individual bobbin the frequency of doffing is decreased and thus the efficiency of the winding or twisting operation is increased and a lesser number- 0f piecings-up of the yarn are necessary in subsequent operations. In most prior bunch building mechanisms the transfer from bunch building to regular traverse has been abrupt, sometimes jerking the yarn so sharply as to cause breakage. A further object of my invention is toprovide builder mechanism capable of winding the preliminary bunch, followed by a traverse of intermediate length thereby to place an abnormally large amount of yarn at the lower part of the bobbin, and then in'turn to follow this intermediate traverse by the regu lar traverse, the change from one traverse to the next being accomplished smoothly and without damage to the yarn.

Other objects and advantages of the present invention will hereinafter be set forth and more fully described with reference to the selected embodiment of the invention disclosed by way of example in the accompanying drawings, in which;

Fig.1 is a fragmentary and more or less diagrammatic view of the lower right-hand part of a ring spinning frame having my improved bunch builder mechanism incorporated therein;

Fig. 2 is a fragmentary side elevation to larger scale, viewed from the left-hand side of Fig. 1, showing the bunch builder mechanism removed from the frame and with the parts in the position which they occupy during the long traverse winding operation;

Fig.3 is a fragmentary end elevation, partly in section, of the builder mechanism illustrated in Fig. 4 is a view from the right-hand side'of Fig. 1, but to larger scale, but omitting certain parts;

Fig. 5 is a fragmentary View illustrating some ofthe parts of the builder mechanism shown in Fig; 2, but in the position which they'occupy near the end of the short traverse winding operation; V

Fig. 6 is a view similar to Fig. 5, with parts omitted, indicating the position of the parts near the beginning of the short traverse wind;

Fig. 7 is a'similar viewillustrating parts which are concerned in the bunch building operation as. they are disposed at an intermediate point in' the bunch building operation;

Fig. 8 is a view'generally similar to Fig. '7 but with additional elements included;

Fig. 9 is a front elevation of the parts shown in Fig. 8; r

Fig. 10 is a view similar to Fig. 8, but showing the parts in the position which they occupy at the completion of the, bunch building operation;

Fig; '11 is an. elevation showing some of the parts .of Fig. 8 but viewed from the opposite side; r

Fig. 12 is an elevation illustrating a pawl device for driving a part of. the short traverse mech- Fig. 13 is an'elevation of a second pawldevice 7 parts;

FigsQlT, 18 and 19 are fragmentary views illustrating details of the traverse advancing mechanism whereby a progressively increasing ad.- vance is obtained;

Fig. is a side elevation of a bobbin wound in accordance with usual practice;

Fig. 21 is a side elevation of a bobbin made in accordance with my present method and showing the increased amount of yarn thereon;

Fig. 22 is a side elevation of a bobbin with a preliminary bunch wound thereon;

Figs. 23, 24, and 26 are fragmentary diagrammatic views, to large scale, illustrating successive steps in. forming the bunch in accordance with my present method;

Fig. 27 is a fragmentary diagrammatic section illustrating the formation of the short traverse wind in succession to the bunch; and

Fig. 28 is a view similar to Fig. 27, illustrating the completion of the bunch and the short traverse wind and the beginning of the long or normal traverse wind.

My improved builder mechanism is here illustrated as applied to a ring spinning frame of conventional type. As shown in Fig. 1, this frame comprises the right-hand end member i forming a support for one end of the fixed spindle rail 2 carrying a series of spindles 3 on which bobbins 3 may be mounted. A vertically movable ring rail 5 is supported by a plurality of lifter rods 6 (but one of these rods being shown), these rods being guided in bearings on the rail 2 and having their lower ends resting on rollers carried by levers 1. Only one of these levers is illustrated in the present drawings, but each lever be understood to be pivoted as at 8 upon a bracket carried by the rail 2 and as being provided with a counterweight 9, the counterweights being normally operative to lift the ring rail and the parts connected thereto. The lever which is illustrated in Fig. l is provided near its free end with a foot-rest or treadle iii by means of which it may be swung in a clockwise direction so as to lower the ring rail to dorfing position, and is also furnished with an upstanding arm ii carrying a sector over which a chain i2 passes and to which one end of the chain is secured. Preferably a link ii connects arms ll of the several levers so that they rock unisonally. The chain 82 passes over a guide pulley l3 and then downwardly to a winding drum forming a part of the builder mechanism M. The parts thus far described are of usual and well known construction.

The builder mechanism comprises the traverse or builder lever 65 (Fig. 2) pivotally mounted upon a stud at it supported by one end member of the machine frame. Preferably this traverse lever is furnished with a counterweight H, as usual. The traverse lever has a lateral arm i8 (Fig. 3) supporting a cam follower roll I9 adapted at times to engage the usual main or long traverse cam This cam is mounted on a shaft 2! supported in suitable bearings in the machine frame and is driven at a proper rate of speed by gearing (not shown) from the drive shaft of the frame. The main traverse cam 2!! is furnished with active portions or lobes 22 (Fig. 4) and intervening depressions, (three such lobes being illustrated) the lobes and depressions acting alternately to depress the traverse lever and to allow it to rise in response to the action of the counterweight ii, the latter tending to keep the roll i9 in contact with the peripheral edge of the cam 2E1.

Near its free extremity the traverse lever [5 supports a transverse stud shaft 23 (Fig. 2) on which turns a chain drum 24 (Fig. 15) having fast thereto a worm wheel 25- protected by a housing 28. One end of the chain i2 is secured to the chain drum 24 and thus, as the traverse lever oscillates up and down, the lever comprising the arms 7 and i i is rocked and the ring rail is correspondingly raised and lowered.

The worm wheel 25 meshes with a worm 2'! (Figs. 2 and 14) fixed on a shaft 28 which turns in suitable bearings Eli carried by the lever I 5. This shaft 28 projects beyond the free end of the traverse lever i5 and its projecting end has fixed thereto a ratchet wheel 29 which is intermittent- 1y turned by a pawl 30 (Fig. 15). This pawl is pivoted at 3! to an arm of a pawl carrier 3H free to turn on the shaft 23 and having a counterweight 32 normally tending to restore the pawl carrier 3P substantially to the position of Fig. 15 after being depressed. The counterweight 32 has an arcuate slot 33 which receives a pin 3t carried by an arm 34 of a control member 35 free to turn on the shaft 28 adjacent to the pawl carrier and having a pair of spaced stops 36 and 37 adapted by contact with contiguous parts of the traverse lever E5 to limit rotation of the controller 35 in either direction. The ultimate limit of movement of the pawl carrier in either direction is thus determined. The pawl has an actuating arm 38 adapted to be engaged by the lower end of a rod 39 (Fig. l) conveniently secured at its upper end to the fixed spindle rail 2. Each time the traverse lever l5 rises, the arm 38 is depressed by engagement with the end of rod 39 and thus advances the ratchet wheel 29 and turns the shaft 28.

For reasons more fully described hereafter, it

is desirable during the early stages of the building operation, to advance the traverse to a slight degree, that is, to an amount less than the normal advance, and, in particular, progressively to increase the advance of the traverse from a minimum amount up to the normal or usual amount. To this end I prefer to make the teeth of ratchet wheel 29 quite small, so that the maximum or normal throw of pawl 35) is sufiicient to turn the ratchet wheel through an are equivalent to several of the ratchet teeth. for limiting the effective throw of this pawl at the beginning of the operation so that it moves the ratchet wheel only one tooth space, for example, but at each successive oscillation of the traverse lever the throw of the pawl is increased until it is restored to normal action.

To accomplish this result I provide a rack bar 42 (Figs. 14 to 19 inclusive) arranged to slide parallel to the shaft 28 in bearings i5 carried by lever i5. with a worm 2= fixed to the shaft 28. At its outer end the bar 42 has an inclined cam or beveled surface it (Figs. 17, 18 and 19) adapted to cooperate with an inclined cam surface 44 on the pawl carrier 3%. At the beginning of the operation, the cam surfaces 43 and 44 occupy the relative positions shown in Fig. 17, and when thus positioned the pawl carrier is permitted to rise after each actuation only enough to allow the pawl to advance one tooth, for example, along the ratchet wheel. The shaft 28 is thus turned a very small amount on the next forward movement of the pawl, and the chain i2 is wound up very slightly so that the advance of the traverse along the bobbin axis is slight. However, each stroke of the pawl 38 not only turns the ratchet wheel and shaft 28 and thus winds up the chain, but it also retracts the rack bar 42 so that the cam surface 43 I then provide This rack bar 42 has teeth which mesh E gradually recedes from the cam surface 44, thus 7 oscillation. Thus the advance of thefltrav'erse grows longer'and longer with each oscillation of the traverse'lever |.5 until the cam surface 44 is entirely clear of the cam surface 43, as shown in Fig-.19; for example. Thereafter each oscillation of the traverse lever results ina full stroke of pawl 3|l'and a consequent normal take-up of chain l2 and normaladvance of the traverse. V

For building the preliminary bunch on the bobbin at the start of the operation; I prefer to provide the main traverse cam 20 with a hub 45 to which is secured a bunch building cam 46 (adapted to impart a short oscillatory movement to leverl5) and a pinion 41 (Figs. Band 7 to 11, inclusive). This cam'46 is here illustrated as provided with six lobes 48 (Fig. I) with intervening depressions, but a greater orlesser number of lobes may be provided, as desired. This cam 46v attimes cooperates with a fiange'or annularrib 48 (Fig. 9) projecting from one face of amutilated or intermittent gear 49 mounted to turn freely on astudshaft 56 carried by an upstanding part Iii of bracket |8 (Fig. 3).

. concentric with the axis of shaft 50 throughout the major part of its circumference, but through an arc of approximately 120 or thereabouts this flange is omitted, leaving a deep gap or recess 5| The gear 4 9, which carries flange 48, is furnished with teeth which normally mesh with the teeth of pinion 41, but the toothedrim of the gear. also has a gap which registers with the gap 5|. counterweight 53 (Figs. 9 and 11)" is adjustably secured to the gear 49 as, for example, by means of a slotted segment 53 and. a bolt 53 so that this counterweight may be adjusted circumferentially about the axis of the shaft 56, thereby to vary its angular relation to the gap 5|. .The position of the counterweight determines the number of teeth of gear 49 with which the pinion 41 will engage as the pinion turns clockwise (Fig. 7) before the pinion reaches the gap in the :gear.

. When the machine is to be doffed, the traverse lever I5 is lowered by the operator, thus freeing the. gear 49 from pinion 41, whereupon the counterweight on gearlSautomatically restores the latter to its normal orstarting position. By

adjusting the counterweight, the gap in the gear may be disposed ata greater or-lesser distance from theinitial point of engagement of the pinion with the gear, and thusthe angle through which otally secured to the main body of the gear 49 and normally held outwardly. by a spring-pressed pin 48 (Figs.'8 and 10) housed in a socket member carried by the gear-45 This pivoted portion or latch 48 preferably projects 'outwardly and eccentrically .to the main part of the flange 48,

" forming a rounded head' portion 48 which is engaged by the cam 46 as the latter nears the gap 5| and yields'inwardly andthus cushions the This' flange or rib 48 is tively short layers (intermediate in length between those used in building the bunch and those which form the bodybf the yarn mass) thereby to shorten the taper of the yarn mass at the lower end of the bobbin and thus to increase the amount of yarn which is wound. To this end I provide the shaft 2 l', which carries the main or'long traverse cam 2|], with a short traverse cam 55 (Fig. 3) This cam turns at the same rate asthe main traverse cam26 and is here shown as having the same number of lobes with intervening spaces. The peripheral edge of thecam 55 at timeslengages a cam follower roll 56 (Figs. 2, 5 and 6) carried by a lever 51 pivoted for adjustment on a stud 58 carried by an upstanding arm 5901 a bracket 60 (Fig.3) secured to traverse lever l5.

1 This lever 51has a head portion-.6lprovided may be' replaced by a roller; if desired) adapted to engage the'peripheral edgeof a cam-follower disk 63 mounted to' turn freely on a stud.64.:projecting from the bracket 66. of the cam-ifollower disk 63 is substantially con.- centric with its axis, except throughout an arc of approximately sixty degrees where it is depressed to form a gap 63 (Figs. 5 and 6) into which the head 6| of the lever 51 may at times drop. The surfaces defining the ends of the gapi63 merge smoothly into the concentric portion of the periphery of the cam to provide easy descent and ascent of the'head 6|. When the cam .46runs off into the gap'5! the cam 55 engages the follower roll 56, whereupon the short traverse wind? ing begins and continues until the head 6 |-of lever 51 falls into the gap 63 'inthe disk 63. Aratchet wheel 65 (Figs. 2, 3, 5and'6) is secure to the hub of disk 63 in coaxialrelation to the latter. A driving pawl 66 (Figs. 2, 5 and; 12) normally engages the teeth of wheel 65 and intermittently turns the latter in a counterclockwisev direction, as viewed in Figs. 2 and 5. This pawl is carried by a lever 66*? mounted to rock-freely on the stud 64. This lever is provided with a counterweight 61 tending to swing the lever in a clock wise direction, as viewed in Figs. 2 and'5, so as to retract the pawl 66, and the latter is so weighted as to tend to engage the ratchet wheel, but is furnished with a tail 68 by means of which it may be lifted outjof action. The pawl carrying lever 66 has an upwardly elongate extension 69 which'lies in the path of an adjustable stud 16 (Figs; 2 and 5) projecting from the face of cam 55. Thus at each rotation of cam 55 the stud-10 engages the part 69 thereby rocking the pawl carrying lever 66 so as to advance the ratchet wheel 65 ifpawl 66 is then in engagement with the latter. The stud 56 which supports cam fol-. lower roll 56 projects laterally (Fig. 3) into the plane of the tail 68 of pawl 66, and when the head 6| of lever 51dropsinto thegap 63 of disk 63,.

menced, T wind a .predetermined'number of rela-' The peripheral edge 1 the stud 56? engages'the tail of pawl at; (Fig. 2)

thus lifting the pawlout of engagement with the I ratchet wheel so as to stop further rotation of the latter.

While the head 6| of lever 51 rides on the con,- centric portion of the periphery of disk 63, the head 6| with its roll 56 transmits oscillatory mo. 'tion from cam 55 to the traverse lever I5, at the same time holding the traverse lever down so low that the main traverse cam ZIlcan not effectively engage the roll I9; However, when head 6| drops into gap 63 the traverse lever rises, by the action'of weight |1, until the roll l9 comes into the field of action of the cam 20, whereupon normal traverse begins.

In order to restore the head SI of lever 51 to the outer, concentric periphery of cam 55 at the start of a new operation, I provide a second pawl II (Figs. 2, 5 and 13) mounted on a second pawl carrying lever II turning freely on the stud 64 and having a counterweight I2 tending to turn the lever in a clockwise direction (Figs. 2 and 5) so as to retract the pawl II. The pawl II is so weighted (as by a tailpiece 13) that it tends to engage the ratchet wheel 65. A fixed pin II limits upward movement of the pawl carrying arm Il A rod I4 is pivotally connected at its lower end to the counterweight I2 and has an elongate hook portion I5 at its upper end having free sliding engagement with the shaft 2|. When the traverse lever 15 is lowered for dofiing, the bend of hook I5 engages the shaft 2i, and continued downward movement of the traverse lever thus actuates pawl II to turn the ratchet 55 and its associated disk 53 far enough to raise the head BI of lever 51 up and out of gap 63 onto the concentric portion of the cam ready to start another revolution.

Although the operation of the device has already been explained, it may briefly be restated as follows:Assuming that the frame has been in operation and that the bobbins have been filled, the frame is first stopped and the parts are placed in position for doffing. To do this, the operator places his foot on the treadle III, thus swinging the lever 'I downwardly and lowering the ring rail, at the same time slackening the chain I2 and allowing the traverse lever I5 to descend part way. Retaining means (not shown) are sometimes provided to hold the treadle in depressed condition until again released. The operator then inserts a crank in a socket in the end of shaft 28 as is usual, and while holding the pawl 35 out of action, rotates shaft 28 so as to unwind the chain l2 from the drum 24, thus allowing traverse lever I5 to descend to its lowest position. In thus reversing the shaft 28, the rack bar 32 is moved outwardly until its beveled or cam end 43 again engages the cam 44 on the ratchet wheel 25 (as shown in Fig. 17). The descent of bar l5 as already described causes the hook 15 to engage shaft 2!, thereby actuating the pawl 'II so as to turnthe disk 63 to the starting position (Fig. 6) wherein the head 61 of lever 5? occupies a position just to the right of the gap'53 Furthermore, the lowering of traverse lever E5 to the dofilng position wholly separates the cam 46 from the gear 49, thus allowing the counterweight 53 to restore the gear 49 to starting position. As already stated, the position of adjustment of the counterweight 53 automatically determines the number of teeth of the gear 49 which intervene between the gap 5| and-the pinion 47 at starting.

When the operator releases the treadle Ill from its retaining means, the lever l5 rises slightly until flange 48 engages cam 46, the teeth of pinion 41 and gear 49 at the same time coming into mesh.

When the machine is started, the traverse lever I5 is actuated by the cam 46, the latter imparting a short vibration to the traverse lever, thus providing a very short up-and-down movement to the ring rail. During this movement a series of layers B of yarn, as indicated in Figs. 23 to 26 inclusive, for example, are disposed at the lower end of the bobbin so as to form the preliminary bunch B (Fig. 22). The number of layers thus wound to form the bunch depends upon the number of lobes of the cam 46 and also on the initial adjustment of the counterweight 53. As here shown, the bunch comprises four layers, but it is to be understood, as already suggested, that a greater or lesser number may be provided, if desired. The cam 46 continues to operate so long as the pinion 41 engages teeth of the gear 49, but it may be noted that at each downward stroke of lever I 5 the pawl 30 advances the ratchet wheel 29 so as to turn the shaft 28 and to take up the chain I2. At the beginning of the operation pawl 30 has but a very short effective stroke so that the shaft 28 turns but little and the chain is taken up so slightly that there is but little advance of the traverse during the bunch building, although a slight advance has been indicated in Figs. 23 to 26 inclusive.

When cam 46 runs off into the gap 5| the cam 55 operatively engages the follower roll 56. Thereafter the short traverse winding P begins and continues (Fig. 2'7 until the head GI of lever 51 drops into the gap 63 in disk 63. During this short traverse, the cam surfaces 43 and 44 continue to recede, slowly but gradually increasing the advance of the traverse, but by reason of this short traverse wind in succession to the bunch building operation, the lower part P of the yarn mass is built up with a much more abrupt shoulder than is usual, with a resultant increase in the amount of yarn on the bobbin of from 5% to When the head 6| of lever 5'! drops into the gap 63 the cam 28 engages the roll l9, whereafter the normal traverse is continued throughout the winding operation. At about the time that the cam 20 engages roll I9, the cam surfaces 43 and 44 disengage so that thereafter the advance of the traverses is uniform while the main yarn mass M is being built. The long traverse winds succeeding the formation of the short traverse are indicated in Fig. 28. The operation thus continues until the bobbin is full, whereupon the machine is again doffed as above described and the operation repeated.

While I have herein illustrated certain desirable mechanism for accomplishing the desired result, I wish it to be understood that the invention is not necessarily limited to the precise arrangement of parts herein disclosed, but that any other and equivalent mechanism operative to perform the desired function and falling within the scope of the appended claims is to be regarded as a part of my invention.

I claim:

1. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, cam means operative to impart a bunch building motion to said lever, cam means operative at the completion of bunch building to impart a short traverse movement to said lever thereby to form the lower part of the yarn mass, and cam means operative to impart a long traverse movement to said lever thereby to form the main part of the yarn mass.

2. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, cam means operative to impart a bunch building motion to said lever, cam means operative to impart a short traverse movement to said lever, cam means operative to impart a long traverse movement to said lever, and means operative automatically to cause said several cam means to come into effective operation in succession.

3. A builder mechanism for use in a machine of the class described, said builder mechanism tomatically to cause the several lever oscillating means to come into efiective operation successively.

i 4. A builder mechanism for use in a machine of the class-describcd, said; builder mechanism comprising a traverse lever, cam means operative to impart a bunchbuildingmotion tosaid lever, cammeans operative at the completion of bunch 7 building to impart a short traverse movement to said lever thereby to form the lower part of the yarn mass, cam means operative at ,the conclusionofthe short traverse movement to impart a longtraverse movement to said lever thereby to form the main part'ofthe yarn mass, and travverse advancing means operative to impart a progressively increasing advance duringa portion at least of the building operation. I 3

, 5. A builder mechanism for use ina machine of the classfdescribed, said builder mechanism com prising a traverse lever, a main traverse cam op erative at timesto oscillate the traverse lever through anarc of normal extent whereby to produce a normal traverse, means operative atthe beginning of the building action to prevent effective operation of the main traverse cam, a short traverse cam operative at times while the maintraverse cam is ineffective to oscillate said lever through an arc of intermediate extent whereby to produce a short traverse, means operative at theinitiation oi the building action to prevent efiective operation of the short traverse cam, and abunch building cam operative while the main traverse cam and the short traverse cam areineffective to oscillate the lever throughan arc of short extent, thereby to form a traverse wound preliminary bunch adjacent to one end of the bobbin. I V

6. A bunch builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam. operative at times to oscillate said lever through an are sufficient to produce a normal or long traverse, a pinion coaxial with said main cam and turning therewith, a bunch builder cam secured to the pinion, a freely rotatable mutilated gear supported by the traverse lever, said gear being cooperable with said pinion, an annular flange coaxial with said gear and fixed relatively to the latter, said flange being of such diameter that when engaged by the bunch builder cam the lever is held out of the field of action of the main traverse cam, the flange and mutilated gear having registering segmental gaps adapted at times to receive the bunch builder cam and the pinion respectively thereby freeing the traverse lever for movement toward the field of action of the main traversecam, and an adjustable count erweight operative when the pinion is freed from the" mutilated gear to reset the latter to a presaid gear being cooperable with said'pinion, an

annular flange coaxial with said gear and fixed relatively to the latter, said flange being of suchdiameter that when engaged by the bunch builder cam the lever is held out of the field of action of the'main' traverse cam, the flange andmutilated gear having registering segmental gaps adapted at times to receive the bunchbuilder cam and the pinion respectively thereby freeing the traverse lever for movement toward the field of action of the main traverse cam, the flange with which thebunch builder cam normally engages: having a resiliently yieldable portion adjacent to one edge of the gap in said flange.

8. A bunch builder mechanism'for use in a machine of the class described,fsaid builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate said lever through an are sufficient to produce a normal or 'longtraverse, a pinion coaxial-with said main cam and turning therewith, a bunch'builder cam securedto the pinion, a freelyrotatable mutilated gear supported by the traverse lever, said gear being cooperable with said pinion,-an annular flange coaxial with said gear and fixed relatively to the latter, said flange being of such diameter that when engaged by the bunch builder cam the lever is held out of the field of action of the main traverse cam, the flange and mutilated gear having registering segmental gaps adapted at times to receive the bunch builder cam and the pinion respectively thereby freeing the traverse lever for movement toward the field of action of the main traverse cam, and a spring-pressed member operative, after the bunch builder cam enters the gap, to prevent reverse movement of the mutilated gear until the traverse lever has beenmoved downwardly preparatory to dofling.

9. A bunch builder mechanism for'use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse earn operative at times to oscillate said lever 7 traverse cam, the flange and mutilated gear having registering segmental gaps adapted at times to receive the bunch builder cam and the pinion respectively thereby freeing the traverse lever for movement toward the field of action of the main traverse cam, means normally tending to reverse the mutilated gear and restore it to a predetermined normal or starting position, and means operative after the bunch building cam enters the gap in said flange to prevent reverse movement of the mutilated gear until the apparatus is made ready for doffing. a. 10. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate the traverse lever through an arc of normal extent whereby to produce a normal traverse, a short traverse cam operative at the beginning of the building action to prevent efiective operation of the main traverse cam, said short traverse cam being operative at times, while the main traverse cam is ineffective, to oscillate said lever through an arc of intermediate extent, thereby to produce a short traverse, a bunch building cam operative at the initiation of the building action to prevent effective operation of the short traverse cam, said bunch building cam being operative while the main traverse cam and the short traverse cam are ineffective to oscillate the lever through an arc of short extent, thereby to form a preliminary bunch adjacent to one end of the bobbin, and means operative automatically to determine the period of operation of the bunch building cam before the short traverse cam becomes effective.

11. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate the traverse lever through an arc of normal extent whereby to produce a normal traverse, a short traverse cam operative at the beginning of the building action to prevent effective operation of the main traverse cam, said short traverse cam being operative at times, while the main traverse cam is ineffective, to oscillate said lever through an arc of intermediate extent, thereby to produce a short traverse, a bunch building cam operative at the initiation of the building action to prevent effective operation of the short traverse cam, said bunch building cam being operative while the main traverse cam and the short traverse cam are ineffective to oscillate the lever through an arc of short extent, thereby to form a preliminary bunch adjacent to one end of the bobbin, and means adjustable at will selectively to predetermine the length of the period of operation of the bunch building cam before the short traverse cam becomes effective.

12. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate the traverse lever through an arc of normal extent whereby to produce a normal traverse, a short traverse cam T operative at the beginning of the building action to prevent effective operation of the main traverse cam, said short traverse cam being operative at times, while the main traverse cam is ineffective, to oscillate said lever through an arc of intermediate extent, thereby to produce a short traverse, a bunch building cam operative at the initiation of the building action to prevent effective operation of the short traverse cam, said bunch building cam being operative while the main traverse cam and the short traverse cam are ineffective to oscillate the lever through an arc of short extent, thereby to form a preliminary bunch adjacent to one end of the bobbin.

13. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate said lever throughout an arc suflicient to produce a normal or long traverse, a short traverse cam coaxial with said main cam and turning with the latter, a freely rotatable ratchet wheel supported by the traverse lever, a cam-follower disk fast to the ratchet wheel, a pawl for intermittently advancing the ratchet wheel, a drive element carried by the short traverse cam, and a pawl carrier engageable by said drive element as the cam rotates, thereby to advance the pawl and ratchet wheel.

14. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate said lever throughout an are sufficient to produce a normal or long traverse, a short traverse cam coaxial with said main cam and turning with the latter, a freely rotatable ratchet wheel supported by the traverse lever, a pawl for intermittently advancing the ratchet wheel, a cam-follower disk coaxial with and fixed to the ratchet wheel, said disk cooperating at times with the short traverse cam, thereby to cause a short traverse motion of the traverse lever, and means operative to impart a bunch building motion to the traverse lever at the beginning of the building operation.

15. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate said lever throughout an arc suificient to produce a normal or longtraverse, a short traverse cam coaxial with said main cam and turning with the latter, a freely rotatable ratchet wheel supported by the traverse lever, a pawl for intermittently advancing the ratchet wheel, a'cam follower coaxial with and fixed to the ratchet wheel, a motion transmitting element interposed between the short traverse at times to receive said motion transmitting element, thereby freeing the traverse lever for movement into the field of action of the long traverse cam.

16. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate said lever throughout an are sufficient to produce a normal or long traverse, a short traverse cam coaxial with said main cam and turning with the latter, a freely rotatable ratchet wheel supported by the traverse lever, a pawl for intermittently advancing the ratchet wheel, a cam follower coaxial with and fixed to the ratchet Wheel, a motion transmitting element interposed between the short traverse cam and the cam follower, the cam follower being of such dimensions that when the transmission element is interposed between the cam follower and the short traverse cam the traverse lever is held out of the field of action of the long traverse cam, the cam follower having a recess adapted at times to receive said motion transmitting element, thereby freeing the traverse lever for movement into the field of action of the long traverse cam, and means operative to throw said pawl out of action when the motion transmitting element enters the recess in the cam follower.

17. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate said lever throughout an are sufficient to produce a normal or long traverse, a short traverse cam coaxial with said main cam and turning with the latter, a freely rotatable ratchet wheel supported by the traverse lever, a pawl for intermittently advancing the ratchet wheel, a cam follower coaxial with and fixed to the ratchet wheel, a motion transmitting element interposed between the short traverse cam and the cam follower, the cam follower being of such dimensions that when the transmission element is interposed between the cam follower and the short traverse cam the traverse lever is held out of the field of action of the'long traverse cam,the cam follower hav- 1 matically actuated, during the operationof placing the parts in doffing position, to operate said .pawl, thereby to advance the ratchet until the motion transmitting element is moved from out the gap and into operative engagementwith the cam follower.

l 18. A builder mechanism for use in a machine of the class described, said builder mechanism comprising a traverse lever, a main traverse cam operative at times to oscillate'the traverse lever through an arc of normal extent whereby to produce a normal traverse, a short traverse cam operative at the beginningof the building action to prevent effective operation of the main traverse cam, said short traverse cam being operative at times, while the main traverse cam is ineffective, to oscillate said lever through an arcof intermediate extent, thereby to produce a short traverse, abunch building cam operative at the initiation of the building action to prevent effective operation of the shorttraverse cam, said bunch building cam being operative whilelthe main traverse cam and the short traverse cam are ineffective to oscillate the lever through an arc of short extent, thereby to form a preliminary bunch adjacent to one end of the bobbin,

and means operative automatically to determine the period of operation of the short traverse cam before the long traverse cam becomes efiective.

19. A builder mechanism for use in a machine of the class described, said builder mechanism comprising 'a-traverse lever, a main traverse cam operative at times to oscillate the traverse lever through .an arc of normal extent whereby: to produce a normal traverse, a short traverse cam operativeat the beginning of the building action to prevent efi'ective operation of the main traverse cam, said short traverse cam being operative at times, while the main traverse cam is ineffective, to oscillate said lever through an arc of intermediate extent,'thereby. to produce a short traverse, a bunch building cam operative at the initiation of the building action'to preventeffective operation of the short traverse cam, said bunch building cam being operative while the main traverse cam and the short traverse cam are ineffective to oscillate the lever through an are of short extent, thereby to for ma preliminary bunch adjacent to one end of the bobbin, and

means operative to advance an element of the short traverse mechanism when the apparatus is made ready for doffing, thereby to restore said comprising a traverse-lever, a main traverse cam operative at times to oscillate the traverse lever through an arc of normal extent whereby to produce a normal traverse, a short traverse cam operative at the beginning of the building action to prevent effective operation of the main traverse cam, said short traverse cam being operative at times, while the main traverse cam is ineifective, to oscillate said'lever throughan arc of intermediate extent, thereby to produce a short traverse, a bunch building cam operative at the initiation of thebuilding action to prevent effective' operation of the short traverse cam, said bunch building cam being operative while the main traverse cam and the short traverse cam are ineffective to oscillate the lever through an arc of short extent, thereby to form a preliminary bunch adjacent to one end of the bobbin, and

means operative automatically to reset the bunch building and short traverse mechanisms to startingposition when the apparatus is made ready element, a traverse lever, a plurality of traverse cams each individually operative to impart a movement of fixed predetermined length respectively to the lever, and advance means operative to transmit movement from the traverse lever to the yarn traversing element, said advance means being constructed and arranged toimpart a progressive increase in advance movement to the traversing element while winding the bunch forming and the secondary layers and to main tain a uniform advance movement of the traversing element while Winding the body layers. JOHN S. FURTADO, JR. 

